How Ohm's law is applied
The calculator uses V = I × R, with V in volts, I in amperes and R in ohms.
Power follows P = V × I. Values are computed from the two fields you provide.
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Ohm's Law Calculator
Solve V = I × R for voltage, current or resistance and check power.
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Enter any two of voltage, current and resistance; the remaining value and power are calculated instantly.
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Assumptions and limits.
- Ohmic, time-invariant resistance.
Frequently asked questions
What if resistance is zero?
A zero-ohm branch is a short circuit. The tool rejects zero resistance because current would be unlimited in the ideal model.